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3 years ago

Solve the system equations. X+2y=0 10y=-5

Mathematics

1 answer:

nexus9112 [7]3 years ago

5 0

Answer:

x=1

y=-1/2

Step-by-step explanation:

x+2y=0....(1)

10y=-5.....(2)

From (2) we can find y.

y=-5/10

y=-1/2

Use that in (1)

x+2*(-1/2)=0

x-1=0

x=1

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Three cards are chosen from a deck of 52 playing cards whit replacement. what is the probability every card will be a hearth?

topjm [15]

You have 13 cards that are hearts and a deck of 52. So you do

13/52(fraction) x 13/52 (fraction) x 13/52(fraction) = 1/64 simplified answer

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3 years ago

Colleen recorded the type of trees in the woods near her house.She counted 20 trees and 50 maple trees.What is the experimental

natka813 [3]

Answer: The required probability is $\dfrac{8}{125}$

Step-by-step explanation:

Since we have given that

Number of spruce tree = 20

Number of maple tree = 50

Total trees = 70

We need to find the experimental probability that the next tree Colleen to get a spruce tree.

So, the probability would be :

$(\dfrac{20}{50})^3=(\dfrac{2}{5})^3=\dfrac{8}{125}$

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3 years ago

Evaluate the expression for x =5 and y= 1 (x-7y)²<br><br> pretty confused

sveticcg [70]

Answer:

-4

Step-by-step explanation:

So since x=5 and y= 1 the new expression would be 1(5-7) to the second power. Using pemdas, 5-7 is -2. -2 to the second power is -4. negative 4 times 1 is negative 4.

5 0

3 years ago

Read 2 more answers

Please help!! 10 points.

TiliK225 [7]

Answer:

$\boxed{ \text{1. 59.44 in}^{2} \text{; 2. 352.7 in}^{2} \text{; 3. 471.6 in}^{2}}$

Step-by-step explanation:

1. Area of base

The radius given is that of the circumcircle.

The general formula for the edge length a of a regular polygon is

a = 2Rsin(π/n)

So,

a = 2 × 5 × sin(π/5) = 10sin0.6283 = 10 × 0.5878 = 5.878 in

The general formula for the area of a regular polygon is

A = ¼na²cot(π/n)

So,

A = ¼ × 5 × 5.878²cot(π/5) = ¼ × 5 × 5.878² × 1.376 = 59.44 in²

2. Lateral area

The general formula for the lateral area L of regular prism is

L = nah

So,

L = 5 × 5.878 × 12 = 352.7 in²

3. Total area

Total surface area = lateral area + 2×base area

S = L + 2B = 352.7 + 2 × 59.44 = 471.6 in²

$\boxed{ \text{B = 59.44 in}^{2} \text{; L = 352.7 in}^{2} \text{; S = 471.6 in}^{2}}$

3 0

4 years ago

Question 9 of 10

makkiz [27]

Answer:

i pretty sure it's B

hope this helps my dude

4 0

3 years ago